Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e37cf6282b82a2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-02 05:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51183dbbe85af3fea66a0d93e84fca4b SHA-1: ffde0fc63dd2b1ab81701d5a99c69cbb7f12837d SHA-256: 12e37cf6282b82a24bef34df2b0c970e6e45f2f7caf12ac2cd78e503044c8644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca6981625---8838241113.pdf In PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/xotilopinug.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/buzetorozavotopiximokil.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607478b24beae---62967826758.pdfIn PDF document text
    • http://short-story.ru/upload/file/fomabuke.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/38123827360.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/84514822230.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/6033455541.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2aae370e559dcb0e309b0493d354dc12/funamekoze.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67089771928.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/84590273054.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63ff6a9eff5c6a799c34b057d3924eb5/72795861822.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/df2cd7886709ca45839bece27cf72dce/dokowo.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/bazukipovikoxilelawobad.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a716e62a529---tifadi.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/reganomukuniwedekaweb.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/41414046561.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cf8143de2f681c18a17ceb779c53e3a8/17943230953.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3d243f44---57915782159.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bs72uvaedo54272kvsnk2k05c0/42588153678.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1620e1c5---buxugejovuxotegerosagaw.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a098f3e7ff---fepabopawefudiradifaratez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=interception+in+opponent%27s+end+zonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 14336 bytes
SHA-256: ac98e1493625df714752bd17698b3ecbc0ee4eae571a0f270a3e62027726a6ca
font_01_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 10344 bytes
SHA-256: b9f777c483ff936333d5a985a4a3bdc2b6a3151d01bd60337d3b116914338fee
font_02_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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